Improvement in file-holders



W. T. NICHOLSON.

FILE-IIGLDER.

Patented June 12, 1877.

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'.ATTEST.

N.PETERS, PHOTO-LITHOGRAFHER. WASHINGTON, D C4 UNITED STATES APA'IENTFFIori,

WILLIAM T. NICHOLSON, OF PROVIDENCE, RHODE `ISLAND, ASSIGNOR 'I'O THENICHOLSON FILE COMPANY, OF SAME PLACE.

iMPR'ovEMENT IN FILE-HOLDERS.

Specification forming part of Letters Patent No. 191.8 l l, dated J une12, 1877; application filed March 15, 1877.

To all whom it may concern.-

Be it known that I, WILLIAM T. NIorIoL- SON, of the city and county ofProvidence, in the Stato of Rhode Island, have invented certain new anduseful Improvements in File- Holders; and I do hereby declare that thefollowing specification, taken in connection with the drawings furnishedand forming a part thereof, is a clear, true, and complete descriptionthereof'.

rlhe prime object of my invention is to provide a file-holder with whicha lile may be readily sprung or bent, and held in that coudition forservice. File-liolders, as heretofore made, have in reality been merehandles of peculiar construction for receiving the tang of` a tile.Saw-filing machines have, however, heretofore embodied a tile-holderhaving as a part thereof a guiding rod or bar, which is litted toslide-bearings, whereby the le may be moved longitudinally to and fro atcertain prescribed angles for securing uniformity in the 4.teeth ofsaws. These machine file-holders Vare provided with a tang-socket andalso with a tip-socket, which receives bodily the tip of a tile, andthese sockets are adjustable with relation to each other, so that thefile may be clamped thereby, and held parallel with the guiding' rod orbar. With these machineholders, any desired degree of eiidwisecompression on the tile may be attained, but the construction of thetip-socket is such that the tip of the tile would be broken if it shouldbe bent, because it is held bodily within the socket.

My invention consists mainly in the comliiiiatioii, with a suitablehandle, of a rear socket which engages with the tang of a tile, a frontsocket which is provided with a shallow recess for receiving the tip ofa file with abutting contact, and suitable means for adjusting' thesesockets with relation to each other, whereby the file may be sprung orbent, and worked in that condition.

A tile-holder having the characteristics described, in combination witha tile. which is sprung, constitutes as an entirety a novel tool; and myinvention further consists in the combination, with a suitable holder,of ale, which is sprung or bent therein.

The value of this novel characteristic of my holder will be. readilyconipreliended when it is remembered that a longitudinally-convex tileis operated with greater ease and ediciency than a fla-t straight tile,especially when working ou large surfaces. llie convex-surfaced file isalso less liable to clog and glaze, and is moreeasily worked than thestraight dat tile, because of the variety of positions which the convexsurface is madel to assume with relation to the surface h'led during thetiling operation, and the consequently limited section of its teethwhich are brought into action.

My iniproveineiit is of importance in enablingtlie operator to takealmost any common file, without special selection as to its curvatureot' face, and give to it such additional curvature, by springing it, asfor the occasion he may require.

To more particularly describe my invention, I will refer to theaccompanying drawings, in which Figure 1 represeiits,'in perspective,one of my tile-holders with a tile therein. Fig. 2 represents in lateralvertical section tlie rear socket of the holder and the talig of a h'leon liiiew', Fig. 1. Fig. 3 represents, in longitudinal central verticalsection, another form ot' holder embodying in v invention. Fig. 4represents, in edge View, a tile witliouta tang, fitted for use with thelioldeil shown in Fig. 3.

'lhe handle ofthe holder is shown at A. In Fig. 1 the handle is soarranged that the le may be used on large surfaces, the axis of thehandle being in a plane above that occupied by the lile. ln Fig. 3 tliehandle is arranged for using the tile on the surfaces of pieces whichmay be held in a vise, for instance, the axis of the handle being, inthis case, in the same plane as the tile.

ln both forms ot' handle, a socket is provided for securing the rear endof the lile. In Fig. 1 the socket is shown at a, provided with a taperedinterior tor tlie reception ofthe tang b, with which hles are usuallyprovided. This socket, with a tang therein, is shown in section iii Fig.z.

In Fig. 3 a socket is shown at c, which is V-sliaped, for receiving thebutt of a tile when, in case the tang has been broken, the end isprepared for the purpose, made V-shaped, as

shown in Fig. 4. rlhe handle in Fig.3 has also an axial socket for thereception of a tang.

It will he seen that in both cases the rear socket will freely permitthe file to be bent outward or downward, because there is beneath thetile no portion of the socket to pre vent such downward or outwardbending. Each rear socket has, however, at its front end, an overlappingportion, which, being in contact with the upper surface of the file nearthe tang, prevents it from bending upward.

Both forms of holders have at the outer end thereof a tip-socket, as ate, which has a V- shaped recess for receiving the tip of a file, whichis beveled from each side, as shown. These sockets may be varied inform; but the V-recess is best suited for general service, as it aiordsa good seat for the file, and is one to which any file may be readilytted, and, at the same time, no portion of a tip-socket thus formedprojects downward, so as to interiere with the operation of thecutting-face of the tile when applied to large surfaces. Any other formwhich will securely hold the le at both ends may, however, be employed,provided that the tip-socket does not embrace the tip of the file, andhas a recess, which will serve simply to retain the socket in abuttingcontact with the prepared tip of the tile, and which will permit it toadjust itself therein, regardless of the extent ,to which the file maybe bent or curved.

1t is obvious that, for convenient service, considering my device as amere holder, it is important that the tip-socket be movable withrelation to the rear socket not only for readily taking and releasing aile, but also for adapting` it for use with tiles of different lengths.When my holder is considered, however, as a device by which a tile,securely held therein, may be bent to any desired degree, and worked inthat condition, the movable tipsocket has a decided value.

The simplest and most effectual means for controlling the tip-socket isa threaded rod and nut, and I have shown two methods of applying them,the two forms of handle shown requiring different methods.

1n Fig. l the tip-socket is connected with the handle by a bent rod,f,on the end of which the socket is formed. The rear end of this rod isthreaded and housed in a tap, g, which is within and connected to thehandle. The outer end of the tap is squared up, as at h, so that awrench may be used thereon, if necessary. Adjacent to the squaredportion the tap is cylindrical, and is loosely em braced in a collar, asat which is connected to, and forms a part of, the shank-socket.

An annular shoulder, as at lc, on the tap, engages with the rear surfaceof the collar i, so that when the handle is turned the tipsocket isdrawn toward the shank-socket.

In Fig. 3 the tip-socket is prolonged, and provided at its rear end witha tap, as at l,

for receiving the threaded rod fm, which is free to turn in a collar, asat n, on the handle. The rear end of this rod is headed, as at o, andhas a bearing against 4the rear surface of the collar n, so that, whenthe rod is turned by means of the linger-wheel p, the tip-socket isdrawn toward the handle.

Although by no means essential, I have ap plied to my holders a centralpost between the rod and the upper surface of the file, as shown at q.This post tends to a more secure holding of the file. In the holdershown in Fig. 1 this post is centrally located on the the rod f, whilein Fig. 3 it is shown to be connected to, and form a part of, thetip-socket below the tapped portion thereof.

Should it be desirable to work a file so bent as to present alongitudinally-concave surface, the rear socket should correspondpractically with the tip-socket, and no post would then be employed, forthis latter would prevent the upward curve ofthe file, and the same istrue of the tang-socket shown in Fig. 1. The rear socket in Fig. 3 has aproper recess but the upper portion of the socket extends forward andengages with the upper surface of the tile, and this would prevent thetile from freely bending upward, and when intended for that peculiarservice the upper portion should be shortened, so that the socket-recesswill practically correspond with that in the tip-socket.

It will be readily seen that, by rotating the handle or the rod, as thecase may be, the tipsocket is moved to and fro for taking in orreleasinga file, or for bending it, and that, while the file is mounted in theholder, it is securely heid, and in a position thoroughly convenient forservice.

I do not limit my invention to the precise' construction shown, for I amwell aware that holders possessing the novel characteristics hereindescribed may be made in various ways without departing from the spiritof my invention.

I claim as new and desire to secure by Letters Patent- 1. A file-holder,embodying in combination a suitable handle and two sockets, which areadjustable with relation to each other, and have recesses therein, whichretain the ile by abutting contact therewith, substantially asdescribed, whereby a file may be sprung longitudinally, to adapt thecurvature of its face to various kinds of work to be dressed, as setforth.

2. The combination, with a suitable longitudinally compressing. fileholder, of a file which is sprung or bent therein, substantially asdescribed.

WILLIAM T. NICHOLSON.

Witnesses:

GEORGE FULLER, THOMAS F. Uoseaovn.

